PPC/s390: [wasm-simd][x64][liftoff] Implement i64x2 signed compares

Port b57a0d19

Original Commit Message:

    Extract code sequence into macro-assembler for reuse between Liftoff and
    TurboFan.

    There is a bit of register-aliasing checking due to the rather strict
    requirements for the code sequence depending on the CpuFetures that are
    supported.

R=zhin@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: Ia7c8adf67ea04eda43966effe71919334da10b58
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2705157


Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72876}